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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cce10da2118c107c4b3cb7640fcd03387b28ff6c90945b07c38e25aac990d4e4' 
  AND token = 'A6tAH8bol6hM3tDR4UTbWYSOPO7ZBu7I7axir4S2ifQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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