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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5abe4a0c38f84fd65a2afdeda633a2a3ee07423d5bbb131376571247ddb24fd' 
  AND token = 'N4lJ/RAVXDPih/Uef/QgNxmga768674FsUfAeR0lmPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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