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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0cb934813f379299a4ef236e401eacbe2bf59d199faef280522c7aa3d8789ed' 
  AND token = 'wYJx/OXaRGeLdLX2WfNGE6i7NNBPBi3UyDT96bJd2e0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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