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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b2e18e56a890330de2b1e9f4565966f39ec35258e7a28c3b0b9b710e883b032' 
  AND token = 'W4FNWO2e4j995OU8SYQVFN9//PAfNtb3iewF4dDgdzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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