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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0f9e1083a97bd18d7cf42cb49f7fd8a4e2a7485f99e0fe802ad0dde77b86def' 
  AND token = 'Ks7f0Mv2wgxLh/ObRBDqpCqQDfHelYvJIDtrQDrDZ1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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