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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47327c7baae7ee3f7717596965d99b67eb47c57080b932a87a25a3bd6e007e9e' 
  AND token = '1n0Ef3Hu90U9xtzTJAi/lLp1Z2qXnAuZsL/KSkLsfvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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