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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92ed44128ea71a2c2b1b51b4bec5d0f13f28cfcefc80b259c4bfe4dde3fcd77d' 
  AND token = 'azl1ulWaBjVxZ3LZgkdyaNtV8nHm2DOEU841Tlmhegs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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