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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3d00933d83737c3979972385a14a28a504d75c2f503d66d23b202119c819d0f' 
  AND token = 'rkFzda0MDZpjNcVYVSCiV6TgyEmJ86TOG/8H5NqY/ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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