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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95ab0b406f820170d4d1ad22488a28a50f75cebc342919f1dc8282cde017f5fa' 
  AND token = '6nm8+wLZ0WT8hOA0CvzxluCVsLN5eMukiDIX+lh8Ikk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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