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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7d4c0cc28f40de2d54733ecb070cb7b23f7ff56565647086a618766b040e60d' 
  AND token = '+AdSKKZpnncZ6QvfZjM71UxamENNSB2TOtlp3tAXWv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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