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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ee91c342005ca5e6630e7e6a17f179ff2bba8884cbe605a6dd50fbb36936655' 
  AND token = 'n0uulhOFO+Qk4NXVUd60+Pp9jjegvXsTILzZSSA999g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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