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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6437e12602c8d7ea3783274c4a833acdea1d7195c87ee2e717f420ef7cf14c7d' 
  AND token = '12wQDEoNr9IcTW9Ni8i/ShEQ9kfUsv7iTIEpKLAA0eQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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