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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a435957a00089fda1662cc5295d4f216c63f918832af2b0084f9c7b268015aed' 
  AND token = '88CHVEd1b+NqAjzv9QN0eiq+ZZEYB2ynutR1V83aH6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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