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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2f3e75d3c4e103f9fe34893f5ab5c5226d3e288b05130b31ca3b069082b45e2' 
  AND token = 'RtUNXfPNUEdUr/6xzHp0rkPvgVyKe/plfNTnp8Dh3pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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