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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1dea66891274bec75fd937ade65dd212a882768522de13f8acf2b2b7e10b260' 
  AND token = 'FadwETvfRRG4ZR0PitWhRXFluEaTJ0TjUHXFnnH5vQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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