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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e980077d22365069b9a0998f7a82f60d86ae12bcf8423293dcb0b30d2ec1d3e8' 
  AND token = '/jle0fz8SNCWIjfENwmeCL9F33YIrsUEqpWgE5kR19c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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