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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '524f96f3a1dd913da802e193240026fd76b6caeeff61732f0fa2083cf9b0d480' 
  AND token = '5QdTNmFodJLdderaQyy57w6us03WntyLna7c3aend8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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