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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e60cb20270c525075593b1d4ee6335c296bcc43a645e0f90924e0280ef4fad21' 
  AND token = 'xmTkYUgIZ9LHoYNkfojCZ4e+pNEy23kaucs9Cri5NYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}