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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aa1d840822e1d302614c8ed3ea02bfc6008e573028b6d0175bdf8222a979a71' 
  AND token = 'rDWwRYK1ubZvPG/YfCzetLc1Aw/QahrM31dh7MSbWh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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