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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b67793446859193e0e3899594afae140052179119ae552e3ee683af9c7eca92' 
  AND token = '3dkMR4dJLwjuFYr4ZbGKo8R9Q+R3tYGcCth8b9M+r9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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