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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '948a6cdf9e311e2f0c288690db6e35bc6dc487afebdfb1a10ffe372bdfadfa8c' 
  AND token = 'fHo/cg3Z9UhUykH+vXHH9ZNb+Lu6um6wFQr3rayUzLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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