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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d7037f37e354052e34be3909a0a7c77ae485c2fdb418ec535007858e0c4945a' 
  AND token = 'OfLYqGUh0iOZBYmdb97vP2OMoer5KHKGwY5KaFTuvOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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