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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '692742f5985cb9f72d2b6d2ff6694f0d2825c3a6d0d1efbc81546fa4e20cc988' 
  AND token = 'mHi8Iz2Lk6kK2BM9nmLRwLFoN3JuQt3Fg0P26nQ3y24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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