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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4cb4bbea3aeecc8271fd77bb3757cc6b21d41e99f84e9fec115a1afe6a9320a' 
  AND token = 'aL6daDfbqk9qdChRB8d3G0NdHisDhQE6Dz2I/FeYx3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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