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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92c296189ab83b6f4bf2c74f3c02899b713ed5503107908d2a5ff921c51a4523' 
  AND token = 'y1TD+KKIuK+Q1jGnc4vVsbJqA6V4wWbdTFyTCTNC6+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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