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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e978c87aeabc02653b4d7c239a1ac0b447f892f3d066efcfc4b3d583b1b196c7' 
  AND token = 'FL9mAPYe5i+ZBtgzLOQextcJT43hMrogacFH7TjVjwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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