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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e277469bd6be8a75357effcec0884e2a19e1d92ef30f54cf2a5acf7b5eee56c3' 
  AND token = 'BAA+uzpKj90MdUAvx3zyB0F5de9R/rRFQ6PNjDvFQWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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