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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2e098d061e081b4e89d3b63f427a1a594cb9847f7f4f5560e74c4c5c79d6c4b' 
  AND token = 'bBFIakaWbsuqDJgvK4LP/i8+PrWV4bsMpcXR+dmRKks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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