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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5fb5cd1027f67cc19ba35881010943bbf2bf952f166dd51d76d3d6fb1581c6b' 
  AND token = 'RfORp5JsfRtljhKhwh6gCd7hl+6BRnPofsIRyHl+5H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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