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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '523366a282fb50681c1d4c4d7938fb7d19f2b047f708290d2d49501c4ead4b10' 
  AND token = 'qK07NvDOb0uKhNTxZu+T1Rbsvr3kK1JNkB84+9lcXus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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