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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eba47d1a1217f582aef28961d8912f485a6d175385a44c2944a226edb413260c' 
  AND token = 'Qi+3Ixf4QYvvuOMF0ArknfGIdrS1XKDxYLk0vSXpqic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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