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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eb1a99b4f1908bb2ba0bbcb0e508a891f364ab1677790c5d5ea52649d32b553' 
  AND token = '7/IqrRBXvEkyVU98UsvwiZ0KceI89h4nn+AKMGIKvbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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