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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bf2799cac0fbe188d23c511a1da882914ef953387ccb98c9a7e459725843c78' 
  AND token = 'Yl0UijVNm8cej4m2ovWPneSwO/IBBEAm1ylC/LEBF0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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