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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd636cf6b55b28a14386ed68bc9e937eed987e679b33d6d163116d2ef1d40998' 
  AND token = 'cBNozQrWy4mECZd8Mp1GN1hK1DM3LeWu4UluuHT5HB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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