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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18a3dbc7119d9cdef34cb96f7b760d51eb0f6c19c1a49f176326d507178e3dd0' 
  AND token = 'XSjvNYgP6kQmRBktib2hoN4hw0u4tcUNVwXQ8gYJit8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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