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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1034db5fe3f431a79af297e49b12148edbc97272ca0e401ebd401de614a62983' 
  AND token = 'Mt228qt/9dnt/18vAEeaaN6u5g196nSzROQ6TrLMg7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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