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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33ee1734834a5f7a96d9cfdc0dad6797752e9574c409c4588e007719a40d13e3' 
  AND token = '1lbWYKXrNFkCbWSkatEvyx4ImyBPrmEvHvd1bne1/uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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