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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82ef96a538bf46c66490936bc5dc92b64c603bd112b82a9105499d6656549aa2' 
  AND token = 'I4bZ1lF085xNEXP06ndhOYl8zXN/b9F3Y1u59Yt7EYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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