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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e03027d0165968d9f8083eb0b6ef44d2a7d119437a8b80cd91d3926716c0dd4' 
  AND token = 'pn61242V2Ttp+yW3C9LFPQlbsXnuO8ROHd62bQ7sXQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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