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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3cfd76fe0514b1bc373ae6f264738df54ad80cd8585c7cff90a9a950a630cb4' 
  AND token = 'sKxCUmS02J28LIloIDeE8R1pZVAHWAnXOJd7WmYq7U0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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