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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a989ad7333e4b858cd0d6f925e904e78ad9cd8430594b963f5290151460e88d' 
  AND token = 'OiWQKOcwmRa/zc9svRURx93LJz9kBQgujqQr0i95qiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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