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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '654a149cf2b6cb0b1d65b0241bfa2871ff3ab9b3c58ceb925b68bd6513295e1a' 
  AND token = 'ocALpPk+i5yWQ6UIVqphC1yUbmdD9gkuoajr+7vE4kY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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