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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2a2443ac618adbc9c9a3f1129d07bef4d30e7a8fd7d6f6f9f24e6fd2d85ee67' 
  AND token = '1ZjaqCmY/zCsd0aBl5aBozE8v/PBoJnuXrp8TFSqK6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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