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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0d276447c98df773cf8901b6a5d3ad249d1fc30e34312c5cdfc7565b6ffa9c9' 
  AND token = 'BqydgaZAQvg/mxDVyEOPMg6t2JlzfVdsg8J7Jt800wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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