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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f270e8a47f04287c56cd4da91c64dea826ce20c9824989dacdf2a436ac1b2056' 
  AND token = 'H39pn44VUgXfEVDr7oU8TZwTnQVoqXwqQaG6i7u0UhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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