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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0937c5e2e2f0ca3c60eeef950b9152e851c05dea41638842ee1fca3e69b57cc7' 
  AND token = 'mTYRvxK4UBZhHEl6oziV/8eSLP37tEA7q+MMf9GNAFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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