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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71585325e0c1ffc890679948eca37b4f99971834673afd9c809c011b183c0683' 
  AND token = '1w0r2Fir3p4fMJ4s99YZwRS9w8Lk/p9FyLH4YhZR/Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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