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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cca55afd8de5f95a82d1a2291a69d7ad165ac579b5d510cb47c923a5725e4545' 
  AND token = '3UnZn0C0PQjeNa4y3PszTjm3WuJWR5n0MuFUhMoIYVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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