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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78c9bca75cc36be6e85867f4c2d6adde555133f5525e65ed37dfc3a099ec5d3c' 
  AND token = 'eUiacU6Y88KmXkIXD7VDORCw4Y37HdfQmack5+Sk47U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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