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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '513e81296925ef856f5cd88f949be6f5171781b52387f589672162937b20e2bc' 
  AND token = 'CYibjXXMX9eygBnvGoKT5Go0A2OGeBB9Fp/kDFU4Mwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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