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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2064a0f3956e79b819f93a526db10b8a59df3017c50f67fe9807f46779c0566' 
  AND token = 'POUsm+afa6G5wF+nIYHRlKko1cNdmTg5/gFOERqfGng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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