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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5ba197dbea2ebae9bdd671b3fa7db36b747edd4992e7d015ec38dcb82f23e2a' 
  AND token = 'FyjQ06CXR1xNZemeQtWjz2dFPv2fSzIK4fo1gG75RUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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