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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '934659f67bf22c426af57f213d79fcf7f1513ae5592727099140281e52607545' 
  AND token = 'sTqJ/tHJNPJkrD73oK4jkZPf6a0GMY5qWJ8iU8//ebg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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