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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87302dc087ada7dd7666c5584d44de36219a022fe8ab72aa6ea905ac888da740' 
  AND token = 'MrFNDV6xD8WK8gu9QuPC95rTkHyEk8k4bZ/ysesq19A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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