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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e70e2ec0412c89867deaf9a8118744a15147c3d88322b044bce336f193c4b87' 
  AND token = 'r8BVHtWK4CQ8gz3u+6xiikdRfL4GaSZqobOsGzqqRz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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