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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c16b5fe954d7ee979c5f08edee53dc7101f40c46944ea155957b07f0068f431c' 
  AND token = '/yKSMHJ5zKrCNogKXHDZsX9pcP/S9aDAbyi90nAjNjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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